Question

I have been trying to build a user control with some custom properties set in the designer. However the control involves some interop code and settings which shouldn’t be adjusted at runtime. Is there a way to stop the values being changed after they have been initially set by the designer code?

Answer 1

Are you able to modify the property definition? One approach is, add a sentinel to the property setter, and allow only one set operation (which would usually be done by InitializeComponent()):

private int _myProperty;
private bool _isMyPropertySet = false;
public int MyProperty
{
    set
    {
        if (!_isMyPropertySet)
        {
            _isMyPropertySet = true;
            _myProperty = value;
        }
        else
        {
            throw new NotSupportedException();
        }
    }
}